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參數(shù)資料
| 型號： | SAF-C513AO |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 34/59頁 |
| 文件大小： | 1634K |
| 代理商： | SAF-C513AO |
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C513AO
Data Sheet
32
02.00
Oscillator Watchdog
The Oscillator Watchdog (OWD) unit is used for three functions:
Monitoring the on-chip oscillator’s function
The watchdog supervises the on-chip oscillator’s frequency. If the frequency is lower than the
frequency of the auxiliary RC oscillator in the watchdog unit, the internal clock is supplied by the
RC oscillator and the device is brought into reset. If the failure condition disappears (that is, if the
on-chip oscillator has a higher frequency than the RC oscillator), the device executes a final reset
phase of typically 1 ms to allow the oscillator to stabilize. Then, the oscillator watchdog reset is
released and the device resumes program execution.
Fast internal reset after power-on
The oscillator watchdog unit provides a clock supply for reset before the on-chip oscillator has
started. The oscillator watchdog unit reset works identically to the monitoring function.
Control of external wake-up from software power-down mode
When power-down mode is terminated by a low level at the INT0 pin, the oscillator watchdog unit
ensures that the microcontroller resumes operation (execution of the power-down wake-up
interrupt) with the nominal clock rate. In power-down mode, the RC oscillator and the on-chip
oscillator are stopped. Both oscillators are started again when power-down mode is terminated.
When the on-chip oscillator has a frequency higher than the RC oscillator, the microcontroller
starts operation after a final delay of typ. 1 ms to allow the on-chip oscillator to stabilize.
Note:
The Oscillator Watchdog unit is always enabled.
Figure 18
shows the block diagram of the Oscillator Watchdog unit.
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